Siri’s default voice settings sound pretty good. Reasonably friendly, calm, and even jokey at times. In some countries, Siri is a ‘she’, in others a ‘he’, but did you know it is possible to change the ‘sex’ of Siri on your device, and even the accent if you so desire?
To change Siri’s voice on the iPhone or iPad:
You can also change the language - with a striking amount of English variations - which is useful if you have a particularly strong accent.
Note: If you do make a change to the language, you’ll need to go through the ‘Hey Siri’ setup steps again, as he/she will need to relearn your voice.
You also have the option to change Siri’s voice and language settings on macOS (macOS Sierra upwards) too.
In some languages, you may have fewer voice options.